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Ravinder,
The RHP zero basically stems from the cap introduced for compensation. Take the case of a simple 2 stage CMOS op-amp, when a cap is introduced between first and second stages to compensate, the transfer function will have a zero in it. This zero can be close or within the BW of your...
If you find out the input impedance of the oscillator, the resistance at the freq. of oscillation should be much larger than the external crystal's resistance to ensure oscillation. The resistance value also influences the oscillator settling time.
Re: Biasing circuit
4th edition of Gray and Meyer teaches you basic to advanced biasing circuits. See active current mirrors chapter. I guess, it is chap.4. Hope this helps.
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